Stone-saw.



No. 824,946. PATENTED JULY 3, 1906. I. M. MoKAY.

STONE SAW.

APPLICATION FILED FEB. 16'. 1906.

0/11/11,, [11/11/11, vl/myl ISAAC M. MGKAY, OF FRUITVALE, CALIFORNIA.

STONE-SAW.

Specification of Letters Patent.

"ratented July 3, 1906.

Application filed February 16, 1906. Serial No. 301,412.

To an /1101)), it may concern:

Be it known that I, ISAAC M. MoKAY, a citizen of the United States,residing at Fruitvale, in the county of Alameda and State of California,have invented new and useful Improvements in StoneSaws, of which thefollowing is a specification.

My invention relates to stone-saws, and especially to the blades ofstone-saws which employ chilled shot, sand, or like abrading material tomake the cut.

In stone-saws where a blade is used consisting of a long flat steelplate supported at both ends and reciprocated in the direction of itslength it is a matter of difficulty to get the shot down underneath theblade so that the blade will ride on the shot, and thereby press theshot into the stone to effect the desired cutting operation. WVith thesehori zontal blades the shot,withasuitable supply of water, is usuallyfed into the cut above or at the sides of the blade and left to find itsway as best it may down between the side of the saw-blade and the stone.The result is that the shot cuts and scours the sides of the slabs,widens the cut, and deflects the saw, since when it finally reaches thebottom of the cut it does not get under the blade properly, but wearsthe blade on its corners until the bottom of the blade becomes sharp andmore or less V-shaped in cross-section. A

. sharp blade is sure to cut crooked.

The object of my invention is to provide a simple cheap stiff practicalblade of the horizontal endwise-reciprocating type, which will beprovided with suitable channels for feeding the shot to the under sideof the blade without its having to come necessarily into abradingcontact with the sides of the cut.

The invention consists of the parts and the construction and thecombination of parts, as hereinafter more fully described and claimed,having reference to the accompanying drawings, in which Figure 1 showsan elevation and edge view of a blade embodying my invention in itspreferred form. Figs. 2, 3, and i show similar views of modifications ofthe invention.

A repesents a blade of any suitable length, width, or thickness. Theblades are usually of steel and about three-sixteenths of an inch thickby four or five inches wide, more or less, and several feet long, withsuitable means at the ends for its rigid attachment in the sawframe. Theblade is designed to be reciprothe blade to have ready access to thebottom I of the cut and directly under the blade. The drawings showvarious ways III which these channels may be formed. In Fig. 1 thecorrugations are shown as sinuous or zigzagged,

which is the preferred form, since this arrangement has the greatadvantage of giving increased stiifness to the blade both againststretching and against bending. Usually with a four or six inch bladethe corrugations will make only one bend 3 but if wider blades aredesired the corrugations may have a correspondingly augmented number ofbends 3, as in Fig. 2.

The corrugations or channels may have flat 01' curved bottoms incross-section, as indicated, respectively in Fig. 1 and Fig. 2.

The depth and the corrugations are prefer ably equal to or slightly inexcess of the diameter of the shot or other abrading material used.Ordinarily with a blade three-sixteenths of an inch thick the sides ofthe finished blade will be offset, so that the blade will have a sinuouscutting edge to effect a cut approximately three-eighths of an inchwide.

The channels not only lead the shot down to the bottom of the cut andout of abrading contact with the walls of the cut, but they direct theshot into the sinuations of the cutting edge and directly beneath and inthe center of the blade.

By this construction the blade is strengthened and stiffened, acontinuous bearing-sur-' face on the under side of the blade ispreserved, and the shot supplied by each channel finds its way directlyunder and in the middle of the path of a correspondingly-offset part ofthe blade. Practice shows, further, that this style of blade cuts fasterand wears longer than a plain unchanneled blade. It cuts straight andmakes a smooth out through the stone. The slabs are not scoured andscratched as they are by a plain straight blade using shot.

The channels may be formed by rolling or stamping or by any otherappropriate means.

l/Vhen a blade is worn down nearly to an angle 3 of the corrugations,the blade may be turned over. The zigzag channels thus permit the use ofa blade after it has become worn down very narrow and still the bladewill be stifi. and continue to cut straight.

Having thus described myinvention, what I claim, and desire to secure byLetters Patent, is

1. An improved saw having a blade of uniform thickness with a sinuouscutting edge, the opposite sides of the blade being corrugated incorresponding lines which extend sinuously from said cutting edge to theback of the blade said side sinuous corrugations communicating with thesinuations of said cutting edge.

2. An improved saw having a blade of uniform thickness and -With asinuous cutting edge, saidblade having its sides provided With othersinuous corrugations which communicate with the sinuations of saidcutting edge.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ISAAC M. MoKAY.

Witnesses:

J. T. HoLLENBEoK,

J. W. ELRoD.

